. 2017 Sep 21;6(9):e006370. doi: 10.1161/JAHA.117.006370
© 2017 The Authors. Published on behalf of the American Heart Association, Inc., by Wiley.
This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
Figure 2.
Study flow chart. NE indicates national estimate.